<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
<script>
	var str = 'lamp';
	alert(str.toUpperCase());		 //	LAMP

		var str = 'oppo';
	alert(str.toUpperCase());		 //	oppo
</script>
</body>
</html>